<md-toolbar class="md-primary" >
   <div class="md-toolbar-tools">
      <md-button class="md-icon-button" ng-click="toggleLeft()">
         <i class="material-icons">menu</i>
      </md-button>
      <span flex layout="row" layout-align="center">网上药店</span>
   </div>
</md-toolbar>

